JP4636041B2 - Driving machine - Google Patents

Description

  The present invention relates to a driving machine for driving a stopper such as a nail using compressed air as a power source.

  An example of a conventional driving machine will be described with reference to FIGS.

  FIG. 6 is a fracture cross-sectional view of the main part of a conventional driving machine, and FIG. 7 is an enlarged cross-sectional view of the main part of FIG. 6. In the illustrated driving machine, compressed air supplied from a compressor (not shown) The pressure is accumulated in the pressure accumulating chamber 2 in the driving machine body 7 through the air hose shown in the figure. A cylindrical cylinder 5 is provided in the driving machine main body 7, and a piston 4 slidable in a reciprocating manner is fitted in the cylinder 5.

  A driver 22 is formed integrally with the lower portion of the piston 4, and a stopper feeding means 25 is provided between a magazine (not shown) and a nose portion 23. A stopper 28 such as a nail housed in the magazine is provided. One by one is fed into the injection port 24 of the nose portion 23 by the stopper feeding means 25.

  Here, the stopper feeding means 25 is constituted by a stopper feeding cylinder 12 and a stopper feeding piston 11, and the stopper feeding piston 11 is fitted and inserted in the stopper feeding cylinder 12 so as to be slidable back and forth. Has been. A feed claw 14 is rotatably attached to the tip of the stop feed piston 11, and the stop feed cylinder 12 is operated to reciprocate the feed claw 14 together with the feed piston 11 along the feed passage 29. When retreating, it hits the shaft of the stopper 28 in the feed passage 29 and rotates so as to retreat from the feed passage 29 to get over the stopper 28, and when moving forward, it enters the feed passage 29 and engages the shaft of the stopper 28. Thus, the stopper 28 is sent.

  Next, when the trigger 1 is pulled, it becomes a driving stroke, the cylinder valve 3 that seals the upper end of the cylinder 5 is opened, the compressed air in the pressure accumulating chamber 2 pushes down the piston 4, and the nose portion is pressed by the stopper feeding means 25. The stopper 28 sent into the injection port 24 is driven at the tip of the driver 22. In addition, the piston 4 after driving collides with the bumper 8, and the remaining surplus energy is absorbed by the bumper 8. When the piston 4 passes through the air hole 5 a, a part of the compressed air is supplied to the return air chamber 6 through the air hole 5 a and the check valve 50. Further, a part of the compressed air supplied to the return air chamber 6 is accumulated in the stop feed cylinder 12 from the return air chamber 6 through the air passages 18 and 19 and is tightly fitted in the stop feed cylinder 12. The sliding feed piston 11 that slides is pushed down, and the feed claw 14 is retracted.

  When the trigger 1 is released, the piston 4 is pushed back by the pressure of the return chamber 6, and the compressed air in the return chamber 6 is exhausted from the upper exhaust port 27 through the lower exhaust port below the bumper 8 or the gap above the cylinder 5 at the top dead center. Then, the feeding claw 14 is returned to the original position by the return spring 13.

Further, a plate having a plurality of small holes 20 is formed by sealing a coupling portion with a packing 16a between a main body side passage 18 communicating with the return air chamber 6 on the main body 7 side and an air passage 19 communicating with the stopper feed cylinder 12. The filter portion 17 is disposed, and an effective cross-sectional area equal to the conventional passage area is secured by the plurality of small holes 20 (see Patent Document 1).
Utility Model Registration No. 2510176

  In the conventional driving machine described above, when the above driving cycle is repeated tens of thousands of cycles, cracks due to impact fatigue are formed on the upper surface of the bumper 8 that absorbs the impact of surplus energy, and the fragments 30 shown in FIG. 7 are generated. . The fine debris 30 is often discharged from the lower exhaust port 21, but in some cases, it enters the stop feed cylinder 12 from the return chamber passage hole 9 via the air passages 18 and 19, and the stop feed There was a problem that the stopper feed piston 11 could not return to the normal position because it accumulated around the piston 11 and the feed became incomplete and the stopper 28 could not be fed normally.

  For this reason, in Patent Document 1, in a structure in which a plate-like filter portion is provided between the air passages in order to prevent the intrusion of the bumper pieces, the pieces are provided in order to prevent the intrusion of the bumper pieces on the air passage. Compressed air force accumulates and once debris is pushed into the air passage and is not easily discharged into the return air chamber, the air passage between the feed cylinders is blocked, so that sufficient compressed air enters the stop feed cylinder chamber. There are drawbacks such as the fact that the supply air is not supplied, the compressed air supplied to the stopper feed cylinder is not exhausted, and the forward and backward movement of the feed piston is incomplete, and the connecting nail cannot be fed normally.

  The present invention has been made in view of the above problems, and the object of the present invention is to prevent the intrusion of the broken piece into the air passage and to feed the fastener even if the bumper is broken and the broken piece is generated. The object is to provide a driving machine that can always perform normally.

  In order to achieve the above object, the invention according to claim 1 is driven by compressed air, a cylinder, a piston fitted in the cylinder so as to reciprocate, a driver connected to the piston, and the cylinder A bumper provided at the bottom of the cylinder, a housing provided to cover the cylinder from the outside and having a pressure accumulating chamber for accumulating compressed air, and a return compressed air provided on the outer periphery of the cylinder to raise and return the piston Return air chamber for storing air, an exhaust port for discharging compressed air below the piston to the atmosphere after the piston returns, and compressed air in the return air chamber flows from the return air chamber passage hole into the stop feed cylinder through the air passage Or a stopper feed piston that moves backward or forward by exhausting, a return spring that biases the stopper feed piston in one direction, and the stop In a driving machine having a feed claw attached to the tip of a piston, a filter portion is provided in an air passage between the return air chamber and the stopper feed cylinder, and the hole is formed near the tip of the convex portion of the filter portion. Is formed.

  According to a second aspect of the present invention, in the first aspect of the present invention, the hole opening in the vicinity of the tip of the convex portion of the filter portion is formed of a thin film mesh, and the mesh is loaded from the outer shell into the return air chamber of the housing. Thus, the hole is opened in the return air chamber.

  According to a third aspect of the present invention, in the second aspect of the present invention, the filter portion is made of plastic, and the filter portion and the mesh are integrally formed.

  According to the present invention, even if a piece of bumper enters the return air chamber and the piece of bumper tries to enter the air passage through the main body side passage due to the flow of compressed air into the stopper feeding means, Since the convex filter portion protruding into the return air chamber is provided in the vicinity of the passage, the intrusion of the fragments into the air passage is prevented by the filter portion, and the feed of the stopper is always performed normally. And since a large opening area can be ensured in the filter part, the inflow area equal to or larger than the air passage can be sufficiently ensured in the filter part, and even if the bumper is slightly damaged and adheres to the filter part, Stopper feed is always normal.

  Further, since the filter portion is configured separately from the housing, the filter portion can be easily taken out from the housing, and the debris attached to the filter portion can be easily cleaned.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  Since the basic configuration of the driving machine according to the present invention is the same as the conventional configuration shown in FIGS. 6 and 7, the basic configuration of the driving machine according to the present invention will be described below with reference to FIGS. explain.

  In the driving machine according to the present invention, compressed air from a compressor (not shown) is accumulated in the pressure accumulating chamber 2 in the driving machine body 7 via an air hose (not shown). A cylindrical cylinder 5 is provided in the driving machine main body 1, and a piston 4 is fitted in the cylinder 5 so as to be slidable back and forth. A driver 22 is formed integrally with the lower portion of the piston 4. When the trigger 1 is activated, the cylinder valve 3 that seals the upper end of the cylinder 5 is opened, and the compressed air in the pressure accumulating chamber 2 Pushing down, the stopper 28 sent into the injection port 24 of the nose portion 23 is driven at the tip of the driver 22.

  Further, a stopper feeding means 25 is provided between the nose portion 23 and a magazine (not shown), and a plurality of stoppers 28 housed in the magazine are arranged one by one by the stopper feeding means 25. It is fed into the injection port 24 of the nose part 23.

  The stopper feeding means 25 includes a stopper feeding cylinder 12 and a stopper feeding piston 11, and the stopper feeding piston 11 is fitted in the stopper feeding cylinder 12 so as to be slidable back and forth. . Further, a feed claw 14 is pivotally supported at the tip of the stop feed piston 11, and the stop feed cylinder 12 is operated to move the feed claw 14 along with the feed passage 29 along with the stop feed piston 11. When reciprocating, the feed pawl 14 turns to retract from the feed passage 29 by retreating from the feed passage 29 when retreating and gets over the shaft of the stop 28, and in the feed passage 29 during advance. And is engaged with the shaft of the stopper 28 to feed the stopper 28.

  Here, the gist of the present invention will be described with reference to FIGS.

  FIG. 1 is a cross-sectional view of the main part of the driving machine according to the present invention, FIG. 2 is a perspective view of the filter part, and FIG. 3 is an enlarged cross-sectional view of the filter part of the driving machine.

  As shown in FIG. 1, a main body side passage 18 for communicating compressed air is formed between the air passage 19 and the return air chamber 6. A filter portion 17 having a hole 20 is provided. The filter portion 17 is formed so as to protrude as a chimney shape of the convex portion 17 b in the return air chamber 6 of the housing 26, and a small hole for communicating the air passage 19 from the filter portion 17 and the main body side passage 18. 20 opens in the vicinity of the upper portion of the convex portion 17b.

  The filter portion 17 is made of a resin such as plastic, and the small holes 20 opened on the outer periphery of the filter portion 17 are formed of a thin-film mesh 17a. The mesh 17a is integrally molded in a state where the mesh 17a is welded from the inside of the filter portion 17. Between the air passage 19, packings 16a and 16b are provided for preventing the compressed air from leaking into the atmosphere. As a result, the filter portion 17 is inserted through the outer wall of the housing 26 through the return chamber 6 to open the small hole 20 of the filter portion 17 into the return chamber 6, so that the filter portion 17 can be separated from the housing 26.

  When the filter unit 17 is loaded from the nose part 23 side of the housing 26, a step 26a for stopping and entering the housing 26 is provided. Further, even when the housing 26 enters from the return chamber 6 side, a structure for preventing the filter portion 17 from being removed, such as restraining with a cylinder, is added because the housing 26 does not come out due to pressure.

  The operation of the driving machine according to the present invention configured as described above will be described below.

  In the driving machine according to the present invention, when the trigger 1 is pulled, the cylinder valve 3 at the upper end of the cylinder 5 is opened, the compressed air in the pressure accumulating chamber 2 pushes down the piston 4 rapidly, and the stopper 28 in the injection port 24 is moved. The dry 22 is driven at the tip.

  The piston 4 after driving collides with the bumper 8 at the lowest point, and the remaining surplus energy is absorbed by the bumper 8 and stops. When the piston 4 passes through the air hole 5a, a part of the compressed air is supplied to the return air chamber 6 through the air hole 5a and the check valve 50. Further, a part of the compressed air supplied to the return air chamber 6 is accumulated in the stop feed cylinder 12 from the return air chamber 6 via the air passage 19 and slides in the stop feed cylinder 12. The feed piston 11 is pushed down to retract the feed claw 14 from the injection port 24.

  Next, when the trigger 1 is released, the piston 4 becomes a return stroke, and the piston 4 is pushed up to the top dead center by the pressure of the return air chamber 6, and the lower exhaust port 21 in the gap with the tip of the driver 22 or the upper part of the cylinder 5. The compressed air in the lower chamber of the piston 4 and the return air chamber 6 is discharged from the upper exhaust port 27 through the gap. At the same time, the air in the stopper feed cylinder 12 is also discharged, and the stopper feed piston 11 and the feed pawl 14 in the stopper feed cylinder 12 return in the feed passage 29 by the force of the return spring 13 provided on the back surface. Then, the stopper 28 is again fed into the injection port 24 and one cycle is completed.

  When the above driving cycle is repeated tens of thousands of times, cracks gradually enter the upper surface of the bumper 8 for absorbing surplus energy, and fragments 30 are generated as shown in FIG. This broken piece 30 is carried by the force of compressed air from the return chamber passage hole 9 into the return air chamber 6 and tries to flow from the main body side passage 18 into the air passage 19 communicating with the fastener feed cylinder 12. Since the filter portion 17 having a large number of small holes 20 formed by the mesh 17a located in the vicinity of the tip of the convex portion 17b is disposed between the main body side passage 18 leading to the return air chamber 6 on the main body 7 side, small fragments 30 and Even large pieces 30 can prevent inflow.

  Further, even if the fragments 30 flow into the main body side passage 18 and the fragments 30 attached to the small holes 22 of the mesh 17a at the tip of the convex portion 17b of the filter portion 17 cover the whole, the filter portion 17 is convex in a chimney shape. Since the projections protrude from the portion 17b, the fragments 30 are diffused by the force of the exhausted compressed air, or are easily dropped and accumulated in the lower direction in the return air chamber 6 due to the mass of the fragments 30 themselves. It does not completely cover the whole. Thereby, the effective cross-sectional area equal to the passage area can be sufficiently secured in the filter portion 17. Further, when the filter unit 17 is separated from the housing 26, the filter unit 17 can be easily taken out from the housing 26. Therefore, it is possible to easily clean the fragments 30 attached in the vicinity of the filter unit 17.

  In the above embodiment, the filter portion 17 having the small hole 20 is provided in the air passage 19 to the stopper feed piston 11 on the return chamber 6 side of the housing 26, and the mesh portion 17a is welded to the filter portion 17. As shown in FIGS. 4 and 5, the filter portion 17 has a chimney-like convex shape as described above, and a small hole 31 is provided in the vicinity of the upper end of the convex-shaped portion 17b. Even if the filter unit 17 can be separated from the housing 26 or integrated with the housing 26, the broken pieces 30 of the bumper 8 are easily accumulated in the lower part of the housing 26, so that the broken pieces 3 enter the air passage 19 from the main body side passage 18. However, compared with the prior art, it is difficult to obtain the same effect as described above.

It is sectional drawing of the driving tool principal part which concerns on this invention. It is a perspective view of a driving machine concerning the present invention. It is an expanded sectional view of a filter part of a driving machine concerning the present invention. It is an expanded sectional view of a filter part of a driving machine concerning another form of the present invention. It is an expanded sectional view of a filter part of a driving machine concerning another form of the present invention. It is a fractured sectional view of the conventional driving machine principal part. It is a principal part expanded sectional view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Trigger 2 Accumulation chamber 3 Cylinder valve 4 Piston 5 Cylinder 5a Air hole 6 Return air chamber 7 Driving machine main body 8 Bumper 9 Return air chamber passage hole 10 Air passage 11 Stopper feed piston 12 Stopper feed cylinder 13 Return spring 14 Feed Claw 16a Packing 16b Packing 17 Filter part 17a Mesh 17b Convex-shaped part of filter part 18 Body side passage 19 Air passage 20 Small hole (hole)
21 Lower Exhaust Port 22 Driver 23 Nose Portion 24 Injection Port 25 Stopper Feeding Means 26 Housing 26a Housing Step 27 Upper Exhaust Port 28 Stopper 29 Feed Path 30 Bumper Fragment 31 Small Hole 50 Check Valve

Claims (3)

Driven by compressed air, a cylinder, a piston inserted in the cylinder so as to be able to reciprocate, a driver connected to the piston, a bumper provided at the bottom of the cylinder, and covering the cylinder from the outside A housing having a pressure accumulating chamber for accumulating compressed air therein, a return air chamber for accumulating return compressed air which is provided on the outer periphery of the cylinder to raise and return the piston, and compressed air below the piston after the piston is restored An exhaust port that discharges the air into the atmosphere, and a stop feed piston that moves backward or forward by flowing or exhausting compressed air in the return air chamber from the return air chamber passage hole into the stop feed cylinder through the air passage; A hammer comprising a return spring for urging the stopper feed piston in one direction and a feed pawl attached to the tip of the stopper feed piston. In the machine,
A driving machine characterized in that a filter part is provided in an air passage between the return air chamber and the stopper feed cylinder, and the hole is formed in the vicinity of the tip of the convex part of the filter part.   A hole opened near the tip of the convex portion of the filter portion is formed of a thin film mesh, and the hole is opened in the return air chamber by loading the mesh from the outer shell into the return air chamber of the housing. The driving machine according to claim 1.   3. The driving machine according to claim 2, wherein the filter portion is made of plastic, and the filter portion and the mesh are integrally formed.

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